2.3 Grounding of the Controller and I/O Units
Unified Controller nv series type2 light Controller Unit Instruction Manual
27
2.3 Grounding of the Controller and I/O Units
The best way to ground the controller unit is to provide a dedicated ground separate
from the power system and use a single point ground for two or more controller units.
The nv series unified controllers are designed to be noise-proof taking the actual
application into consideration and the equipment itself is sufficiently noise-proof.
However, grounding is very important to ensure the safety and stable operation of the
system. Ground the controller according to the notes described below.
■ Notes on grounding
Note the following on grounding the controller:
(1) Do not place the controller unit so that it may be a passage of ground current
from other units. Take special care of high-frequency current.
(2) Set an equal ground potential on the controller and I/O units.
Use a single-point ground.
(3) Do not connect the ground to the ground line of the power system.
High-frequency should be isolated.
(4) Do not connect the ground to an unstable part.
Do not connect the ground to a part having unstable impedance such as a
painted screwed part, or a part subject to vibration.
Ground the controller.
Failure to do so may cause an electric shock or fire.
Turn off the power before wiring.
Failure to do so may cause an electric shock or
malfunction.
Use a sheath crimping terminal or apply tape on the
module cable.
Exposed conductive part may cause an electric shock.
Assign qualified personnel for wiring.
Wrong wiring may cause a fire, electric shock or
malfunction.
◆
Important
・
Connect all required wires and cables.
Be sure to use a sheath crimping terminal for cables.
・
Check proper and secure wiring and connection before closing the terminal block
cover of the module.
Note
・
Do not connect anything to the NC part.
WARNING
WARNING
WARNING
Mandatory
Mandatory
Mandatory
Ground
CAUTION
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